more info on each category needed
语音健康
出于显而易见的，以及法律上的原因，本网站的任何页面都不提供健康建议。这里的所有信息仅为假设性内容，不应被无条件信任。
SOVTEs
半封闭声道练习（Semi Occluded Vocal Tract Exercises）
explains SOVTEs and how they help with phonation and stability
哼鸣练习（Humming）
explains benefits of light humming as a way of determining roughly a voice's state
过度进行 SOVTEs
explains how hyperadduction is bad and you can do SOVTEs wrong and cause more problems
explains how you shouldn't just do SOVTEs for hours a day